services: cuirass: Add more configuration fields.

* gnu/services/cuirass.scm (<cuirass-configuration>)[parallel-evaluations]
[evaluation-ttl, web-threads]: New fields.
(cuirass-shepherd-service): Honor them.
* doc/guix.texi (Continuous Integration): Document them.

Change-Id: I33485b978d2a37ee93230b1d425731e6cb3b80e4

doc/guix.texi

@@ -37863,15 +37863,27 @@ Note that individual jobset specifications may override this in their
 @code{period} field; the value specified here is only used for
 specifications that use the default @code{period} value, which is zero.
 
+@item @code{parallel-evaluations} (default: @code{#f})
+Maximum number of jobset evaluations that may run concurrently.  If
+@code{#f}, that number is determined based on a number of CPU cores,
+with an upper bound of 8.
+
 @item @code{ttl} (default: @code{2592000})
 Duration to keep build results' GC roots alive, in seconds.
 
+@item @code{evaluation-ttl} (default: 24 months)
+Number of seconds after which an evaluation may be deleted from the
+database.
+
 @item @code{build-expiry} (default: 4 months)
 Duration in seconds after which pending builds are canceled.  This helps
 ensure that the backlog does not grow indefinitely.
 
 @item @code{threads} (default: @code{#f})
-Number of kernel threads to use for Cuirass. The default value should be appropriate for most cases.
+@itemx @code{web-threads} (default: @code{#f})
+Number of kernel threads to use for Cuirass (main process) and for the
+web interface (the @command{cuirass web} program).  The default value
+should be appropriate for most cases.
 
 @item @code{parameters} (default: @code{#f})
 Read parameters from the given @var{parameters} file.  The supported

gnu/services/cuirass.scm

@@ -101,12 +101,18 @@
                     (default "cuirass"))
   (interval         cuirass-configuration-interval ;integer (seconds)
                     (default 300))
-  (ttl              cuirass-configuration-ttl ;integer
+  (parallel-evaluations cuirass-configuration-parallel-evaluations
+                        (default #f))             ;integer | #f
+  (ttl              cuirass-configuration-ttl     ;integer
                     (default 2592000))
+  (evaluation-ttl   cuirass-configuration-evaluation-ttl
+                    (default (* 24 30 24 3600)))  ;integer (seconds)
   (build-expiry     cuirass-configuration-build-expiry
                     (default (* 4 30 24 3600)))   ;integer(seconds)
   (threads          cuirass-configuration-threads ;integer
                     (default #f))
+  (web-threads      cuirass-configuration-web-threads ;integer | #f
+                    (default #f))
   (parameters       cuirass-configuration-parameters ;string
                     (default #f))
   (remote-server    cuirass-configuration-remote-server
@@ -145,9 +151,12 @@
         (user             (cuirass-configuration-user config))
         (group            (cuirass-configuration-group config))
         (interval         (cuirass-configuration-interval config))
+        (parallel-evaluations (cuirass-configuration-parallel-evaluations config))
         (ttl              (cuirass-configuration-ttl config))
+        (evaluation-ttl   (cuirass-configuration-evaluation-ttl config))
         (build-expiry     (cuirass-configuration-build-expiry config))
         (threads          (cuirass-configuration-threads config))
+        (web-threads      (cuirass-configuration-web-threads config))
         (parameters       (cuirass-configuration-parameters config))
         (remote-server    (cuirass-configuration-remote-server config))
         (database         (cuirass-configuration-database config))
@@ -173,12 +182,23 @@
                         "--specifications" #$config-file
                         "--database" #$database
                         "--interval" #$(number->string interval)
+                        #$@(if parallel-evaluations
+                               (list (string-append
+                                      "--parallel-evaluations="
+                                      (number->string evaluation-ttl)))
+                               '())
                         #$@(if ttl
                                (list (string-append
                                       "--ttl="
                                       (number->string ttl)
                                                  "s"))
                                '())
+                        #$@(if evaluation-ttl
+                               (list (string-append
+                                      "--evaluation-ttl="
+                                      (number->string evaluation-ttl)
+                                                 "s"))
+                               '())
                         #$@(if build-expiry
                                (list (string-append
                                       "--build-expiry="
@@ -232,6 +252,10 @@
                         "--database" #$database
                         "--listen" #$host
                         "--port" #$(number->string port)
+                        #$@(if web-threads
+                               (list #~(string-append "--threads="
+                                                      #$web-threads))
+                               '())
                         #$@(if parameters
                                (list #~(string-append "--parameters="
                                                       #$parameters))

gnu/system/examples/bare-bones.tmpl

@@ -3,8 +3,8 @@
 ;; for a "bare bones" setup, with no X11 display server.
 
 (use-modules (gnu))
-(use-service-modules networking ssh)
+(use-service-modules cuirass networking ssh databases)
-(use-package-modules screen ssh)
+(use-package-modules databases screen ssh)
 
 (operating-system
   (host-name "komputilo")
@@ -48,8 +48,14 @@
   ;; Add services to the baseline: a DHCP client and an SSH
   ;; server.  You may wish to add an NTP service here.
   (services (append (list (service dhcpcd-service-type)
+                          (service cuirass-service-type
+                                   (cuirass-configuration
+                                     (specifications #~(list))))
+                          (service postgresql-service-type
+                                   (postgresql-configuration
+                                     (postgresql postgresql-14)))
                           (service openssh-service-type
                                    (openssh-configuration
-                                    (openssh openssh-sans-x)
+                                     (openssh openssh-sans-x)
-                                    (port-number 2222))))
+                                     (port-number 2222))))
                     %base-services)))